Who else wondered at first how could something as small as this be 23A and 12V? Turns out 'A23' is actually the battery type, the actual capacity is around 55mA. : r/batteries
A23 Battery — Moss LED
Amazon.com: CELEWELL A23 23A Alkaline (5-Pack) Battery Same as 23AE L1028 MN21 【5-Year Warranty】 : Electronics
GP 23A A23 MN21 Batteries | 1 Pack
High Voltage A23 12V Alkaline Battery (23A, V23GA, MN21) - RC GEAR BD